Monoanionic bis(carbene) pincer complexes featuring cobalt(I-III) oxidation states

Dalton Transactions : an International Journal of Inorganic Chemistry
Abdulrahman D IbrahimAlison R Fout

Abstract

The synthesis and characterization of a series of cobalt complexes featuring a pincer bis(carbene) ligand of the meta-phenylene-bridged bis-N-heterocyclic carbene ((Ar)CCC, Ar = 2,6-diispropylphenyl or mesityl) are reported. Cleavage of the aryl C-H bond of the ligand was achieved in a one-pot metalation procedure using Co(N(SiMe3)2)2(py)2, an equivalent of exogenous base, and trityl chloride to form the ((DIPP)CCC)CoCl2py complex. This species could be reduced to the Co(ii) and Co(i)-N2 molecules with the appropriate equivalents of reductant. Subsequent generation of ((Mes)CCC)Co(I-III) derivatives with the mesityl ligand proceeded in good yields. A suite of characterization techniques and the interconversion between all three oxidation states of the cobalt complexes is described.

References

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Citations

Nov 28, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Magdalena Quezada-MirielMatthew Asay
Dec 14, 2018·Chemical Communications : Chem Comm·Rafal M Dziedzic, Alexander M Spokoyny
May 28, 2021·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Safiyah R MuhammadAlison R Fout
Mar 8, 2019·Chemical Reviews·Andreas A DanopoulosPierre Braunstein
Sep 15, 2017·Journal of the American Chemical Society·Kenan TokmicAlison R Fout

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